Are you certain that you rebuilt your image and that the pterm in the image is the one you included? What happens if you run the build (mkifs) with lots of additional verbosity (-vvvvvvvv) you should see the file being included in the image and the permission associated with it. You could also use dumpifs -vvvvv on the image once it is built.

yes, i first exported the build file from the ide, changed the permissions in the notepad and then inported the edited build file in the new QNX System Builder Project. When we try to run the build with lots of additional verbosity, it apparently has no effect on the permissions.
Moreover, if I try to change the permission, after the build, by chmod.....it also gives an error.